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A Machine Tool Chatter Online Monitoring Method Based on Wavelet Packet and Hilbert Transform

A wavelet packet and flutter technology, which is used in measuring/indicating equipment, metal processing mechanical parts, special data processing applications, etc., can solve the problem of real-time flutter monitoring and online monitoring algorithms in processing signals for long-term processing path data. and other problems to achieve the effect of online identification and monitoring

Active Publication Date: 2019-05-28
TIANJIN UNIV
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Problems solved by technology

[0003] Most of the research on chatter monitoring at home and abroad is limited to monitoring the occurrence of chatter through the method of pattern recognition, but the online monitoring algorithm cannot target the data of long-term processing paths in the selection of processing signals, because it cannot realize real-time chatter. Therefore, providing a chatter monitoring strategy based on real-time small sample data to realize early identification of machining chatter is an effective method to solve such problems

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  • A Machine Tool Chatter Online Monitoring Method Based on Wavelet Packet and Hilbert Transform
  • A Machine Tool Chatter Online Monitoring Method Based on Wavelet Packet and Hilbert Transform
  • A Machine Tool Chatter Online Monitoring Method Based on Wavelet Packet and Hilbert Transform

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[0037] Because the fundamental frequency of flutter has good sensitivity to the system, as long as the stability of the system changes, it can appear in the frequency spectrum of the signal after wavelet packet and Hill transform. It overcomes the shortcomings of traditional monitoring methods that require long-term processing path data, and can realize early identification of chatter, which is of great significance for online monitoring of cutting chatter status.

[0038] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 As shown, a kind of cutting chatter on-line monitoring method flow process based on wavelet packet and Hilbert transform of the present invention comprises the following steps:

[0040] Step 1. Obtain the original signal of the cutting process within a certain period of time. The original signal mainly includes the cutting force signal between the tool and the workp...

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Abstract

The invention discloses a machine-tool-chattering online monitoring method based on a wavelet packet and Hilbert transform. The method includes the steps that processing signals in one period of a cutting tool in original signals are subjected to wavelet decomposition and reconstruction, and the signals are decomposed on different frequency band scales; then signals of the different frequency band scales are subjected to Hilbert transform, and low-frequency envelope signals are extracted. The low-frequency envelope signals are subjected to frequency spectrum analysis; if the low-frequency envelope signals are simultaneously in envelopment frequency spectra of the multiple frequency band scales, a spectrum peak is formed at some frequency smaller than a rotation frequency, the frequency is the chattering frequency, and meanwhile it means that a system is chattered. According to the machine-tool-chattering online monitoring method, online monitoring of cutting chattering can be better achieved through wavelet packet decomposition, Hilbert transform and spectrum peak identifying, and the machine-tool-chattering online monitoring method is of great significance in machine-tool-chattering monitoring achievement under fixed parameter cutting.

Description

technical field [0001] The invention relates to the technical field of on-line detection of machining, in particular to the technical field of machine tool chatter state monitoring and identification. Background technique [0002] High-speed machining has become a key technology to significantly improve production efficiency and reduce production costs in machining. With the substantial increase of the spindle speed of the machine tool, the stability of high-speed machining and its influence on the surface quality are faced. Cutting chatter is a spontaneous oscillation between workpiece and tool during cutting, which will seriously affect the machining performance of machine tools. It is one of the important problems that must be solved in modern precision machining. The main direction of current research is to predict the stability of chatter machining, and select chatter-free parameters for optimized machining. However, due to the complexity of the machine tool system in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q17/12G06F17/14
CPCB23Q17/12G06F17/148
Inventor 王国锋杨凯杨星焕张全彪董毅桑玲玲
Owner TIANJIN UNIV
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